66691004 has 12 divisors (see below), whose sum is σ = 118687800. Its totient is φ = 32780208.

The previous prime is 66691003. The next prime is 66691019. The reversal of 66691004 is 40019666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66691003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 141059 + ... + 141530.

It is an arithmetic number, because the mean of its divisors is an integer number (9890650).

Almost surely, 2^66691004 is an apocalyptic number.

It is an amenable number.

66691004 is a deficient number, since it is larger than the sum of its proper divisors (51996796).

66691004 is a wasteful number, since it uses less digits than its factorization.

66691004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 282652 (or 282650 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 66691004 is about 8166.4560244943. The cubic root of 66691004 is about 405.5294685610.

The spelling of 66691004 in words is "sixty-six million, six hundred ninety-one thousand, four".